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A normal day of work for Master Chief is a little different than a day at the office. His day usually includes, driving to work in a Rocket Warthog, dual wielding M6 pistols against enemy Covenant soldiers and destroying alien headquarters with extreme prejudice. Doing all that kind of stuff without a SPARTAN helmet is just an accident waiting to happen, so you'll never see him running into a fight without it. Of course, you'll probably just use it to feel awesome while playing Halo, which is totally fine with us.